Mixing device for preparing mixtures such as mayonnaise and salad dressing



, 1941 A w. A..McLEAN MIXING DEVICE 2,248,886 FOR PREPARING MIXTURES SUCH AS MAYONNAISE AND SALAD DRESSING Original Filed March 31, 1936 July 8 Patented July 8, 1941 MIXING DEVICE Fon PREPARING MIX- TURES SUCH AS MAYONNAISE AND SALAD DRESSING William A. McLean, Geneva,

Geneva Processes, Inc.,

poration of New York Original application March 31, 1936, Serial No. 71,932. Divided and this application January 5, 1938, Serial No. 1940 4 Claims.

My invention relates to mixing and emulsifying devices for materials such as emulsions containing high percentages of oil, such as mayonnaise, salad dressings, insecticide emulsions, etc. The mixtures may or may not be truly colloidal.

This application is a division of my co-pending case Serial No. '71,932 filed March 31, 1936, now Patent No. 2,125,455 dated Aug. 2, 1938.

An object of my invention is tofprovide a device of the character described which will quickly and simply make a homogeneous mixture, or a colloid, if desired.

A further object of the invention is to provide a construction which is simple and durable and which is easily repaired and with parts easy to replace. y H

A still further object of my invention is to provide a mixing mill which has a large output with small consumption of power and which gives a desired homogeneity to the nal product.

With these and other objects in view, which maybe incident to my improvements. the invention consists in the parts and combinations to be hereinafter set forth and claimed, with the understanding that the several necessary elements comprising my invention may be varied in construction, proportions and arrangement, without departing from the spirit and scope of the appended claims.

In order to make my invention more clearly v understood, I have shown in the accompanying drawing means for carrying the same into practical eiect without limiting the improvements in their useful applications to the particular constructions, which, for the purpose of explanation, have been made the subject of illustration.

In the drawing,

Figure 1 is a viewv in longitudinal section of one form of my mill;

Figure 2 is a view taken along the line 2 2.

of Figure 1, looking in the direction of the arrows. y

Referring to the drawing I have shown a support structure I provided with support spiders 2, the base of the support structure I being `des f ignated by the numeral 3. The base 3 is adapted to lle on the casing 4 of an electric motor. The

N. Y., assignor to Geneva, N. Y., a cor- 183,549. Renewed June 14,

shaft of the motor projects upwardly, as indicated at 5, and is coupled by means of a coupling 6 to a shaft 1 of a rotor member 8. The shaft 1 is journaled in the supporting structure I at 'a point 9. Above the point 9, and' forming the casing, is a cylindrical aperture I8 in which are housed journal members I I and l2.

The rotor 8 is a frusta-conical element with-a smooth surface. Mounted over a cylindrical operature I3 formed in the upper partvv of the support structure I is a cylindrical support element lI4 which is held by means of nuts I5 screwed through brackets I6 in the support strucshaped central chamber 22 and an exterior wall 23.

Formed at the top of this member 28 is av -flange 24 which is adapted to rest on top of thel annulus I 8. In the top of the member 28 is an aperture 25 which is interiorly threaded 'and which is adapted to receive screw threaded extension 26 of. a filling funnel or hopper 21. In this construction the rotor member 8 consists of two frusto-conical rotor members 28 with two frusto-conical sections having end surfaces lying in a continuation of eachother. VThe device is provided with a frusto-conical working surface 29 which is approximately of the same dimensions as the end surface of the v lower frustoconical section 28.

The clearance between the rotor 8 and the bottom of the mixing chamber, i. e., the bottom of the interior portion 22 of the mixing chamber, is controlled by raising and lowering the entire mixing chamber construction 28 by means of rotating the handles I9 to screw the annular member I8 up or down, as desired. When the proper adjustment has been made, wing nuts 3| on the bolts 32 may be tightened to hold the adjustment fixed.

Below the bottom of the rotor is a receiving chamber 33 which is provided with a slanted chute-like element 34 against which the mixture falls. The mixture, such as mayonnaise, flows down the chute element 34 and out at the aperture 35. 'I'he chute element 34 may be provided with apertures 38 through'which may be flowed steam or cooling liquid, as desired.

In order to prevent splashing ofthe material, apertureI 35 is closed with a cover plate 31 which is held in place by knurled nuts 38 which are screwed on bolts 33 inserted in the metal of the surface of the rotor 8 having been effected, the

mixture is poured into the mixing chamber 22 until the surface of the rotor is completely covered, and in fact, under certain conditions, it is well to have the entire mixing chamber 22 filled l with the rough mixture before mixing is started.

The mixture is further homogenized in passing out through the aperture between the bottom of the mixing chamber 22 and the rotor 8. The mixing chamber 22 can be cooled or heated by the fluid in its jacket as desired. The finished mixture, which may be mayonnaise or some similar material, falls into the space 33 below the rotor 8 where it may be either heated or cooled through uid in the aperture 36 below the slide 34. The material flows out through the aperture 35 into a receptacle.

While I have shown and described the preferred embodiment of my invention, I wish it to be understood that I do not confine myself to the precise details of construction herein set forth, by way of illustration, as it is apparent that many changes and variations may be made therein, by those skilled in the art, without departing from the spirit of the invention, or exceeding the 4scope of the appended claims.

l. In a mixing and emulsifying mill, a bowlshaped mixing chamber provided with an outwardly and downwardly extending annular working portion, a double frusto-conical rotor, cornprising upper and lower sections, the upper section having a smaller diameter than the lower section and being disposed in the said mixing chamber above the outwardly and downwardly extending annular portion thereof, the lower section being disposed in the mixing chamber in spaced relation to and substantially in the same horizontal plane with the said outwardly and downwardly extending working portion, and the said lower section and outwardly and downwardly extending. working portion of the mixing chamber defining an outlet from the mixing chamber.

shaped mixing chamber having an annular laterally off-set working surface at the lower end portion thereof, a double frusto-conical rotor comprising upper and lower sections being disposed in said mixing chamber, the upper section being of smaller diameter than the lower section, and the said lower section and laterally off-set working surface defining an outlet from the mixing chamber.

3. In a mixing and emulsifying mill, a bowlshaped mixing chamber having a frusto-conical Iworking, stator surface at the lower end portion thereof, a double frusto-conical rotor disposed in the mixing chamber, said rotor being composed of upper and lower sections. having unequal diameters and the said lower section and frustoconical working stator surface defining an out- 2. In a mixing and emulsifying mill, a bowl- 

